Issue 6598. Fix for hanging during parsing incomplete 'switch'.

compiler/java/com/google/dart/compiler/parser/DartParser.java

Index: compiler/java/com/google/dart/compiler/parser/DartParser.java
diff --git a/compiler/java/com/google/dart/compiler/parser/DartParser.java b/compiler/java/com/google/dart/compiler/parser/DartParser.java
index 055b5b0f89536b7635356fa61d5195e1bf0f1eb5..1ec8358b65765a60f0eddf1a1002fd8d179a3f93 100644
--- a/compiler/java/com/google/dart/compiler/parser/DartParser.java
+++ b/compiler/java/com/google/dart/compiler/parser/DartParser.java
@@ -4931,7 +4931,7 @@ public class DartParser extends CompletionHooksParserBase {
     while (!done) {
       List<DartLabel> labels = new ArrayList<DartLabel>();
       beginSwitchMember(); // switch member
-      while (peek(0) == Token.IDENTIFIER) {
+      while (peek(0) == Token.IDENTIFIER && peek(1) == Token.COLON) {
         beginLabel();
         DartIdentifier identifier = parseIdentifier();
         expect(Token.COLON);
@@ -4951,7 +4951,7 @@ public class DartParser extends CompletionHooksParserBase {
         done = true;
         done(null);
       } else {
-        if (peek(0) != Token.EOS) {
+        if (peek(0) == Token.DEFAULT) {
           members.add(parseDefaultMember(labels));
         }
         expectCloseBrace(foundOpenBrace);